/* ── Navigation ────────────────────────────────────── */
#nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: transparent;
  transition: background var(--ease);
}

#scroll-progress {
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 0%;
  background: var(--accent);
  transition: width 0.1s linear;
  pointer-events: none;
}

#nav.scrolled {
  background: rgba(242, 239, 232, 0.92);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

/* Logo: mark + "Vela" dark + "tum" petrol */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 1.1rem;
  font-weight: var(--fw-semibold);
  letter-spacing: -0.02em;
  color: var(--text);
  flex-shrink: 0;
}


.nav-logo-mark {
  height: 26px;
  width: auto;
  flex-shrink: 0;
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1),
              filter 0.3s ease;
}

.nav-logo:hover .nav-logo-mark {
  transform: scale(1.15) rotate(-8deg);
  filter: drop-shadow(0 6px 14px rgba(89, 129, 136, 0.45));
}

.nav-logo-text {
  transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1),
              color 0.25s ease;
}

.nav-logo:hover .nav-logo-text {
  transform: translateX(3px);
  color: var(--accent);
}

.nav-right {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 40px;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: var(--fw-normal);
  color: var(--text);
  padding: 0;
  transition: color var(--ease);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link:hover { color: var(--accent); }
.nav-link:hover::after { transform: scaleX(1); }

/* Language toggle */
.lang-toggle {
  display: flex;
  align-items: center;
  background: rgba(74, 63, 53, 0.08);
  border-radius: var(--r-full);
  padding: 3px;
  margin-left: var(--sp-5);
  gap: 2px;
  position: relative;
}

.lang-toggle::before {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  bottom: 3px;
  width: calc(50% - 4px);
  background: var(--accent);
  border-radius: var(--r-full);
  transition: transform 0.28s cubic-bezier(0.34, 1.2, 0.64, 1);
  pointer-events: none;
}

.lang-toggle[data-active="en"]::before {
  transform: translateX(calc(100% + 2px));
}

.lang-btn {
  font-size: 0.6875rem;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 4px 11px;
  color: var(--text-muted);
  background: transparent;
  border-radius: var(--r-full);
  transition: color var(--ease);
  line-height: 1.5;
  position: relative;
  z-index: 1;
}

.lang-btn.active { color: #fff; }

.lang-btn:hover:not(.active) { color: var(--text); }

/* Hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: var(--sp-2);
  border-radius: var(--r-sm);
  cursor: pointer;
  background: none;
  border: none;
  margin-left: var(--sp-3);
  transition: background var(--ease);
}

.nav-hamburger:hover { background: var(--bg-card); }

.nav-hamburger span {
  display: block;
  height: 1.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--ease), opacity var(--ease);
}

.nav-hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile drawer */
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  background: rgba(242, 239, 232, 0.97);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
  padding: var(--sp-4) var(--sp-6) var(--sp-6);
  z-index: 99;
  flex-direction: column;
  gap: var(--sp-1);
  animation: slideDown 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-mobile.open { display: flex; }

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}

.nav-mobile .nav-link {
  font-size: 1rem;
  padding: var(--sp-3) var(--sp-2);
  border-bottom: 1px solid var(--border);
  border-radius: 0;
  color: var(--text-mid);
}

.nav-mobile .lang-toggle {
  margin-left: 0;
  margin-top: var(--sp-4);
  align-self: flex-start;
}

@media (max-width: 720px) {
  .nav-links              { display: none; }
  .nav-right > .lang-toggle { display: none; }
  .nav-right > .nav-linkedin { display: none; }
  .nav-hamburger          { display: flex; }
}